電算化 斷層撮影 影像의 精度管理에 관한 硏究

兪長壽,金慶根 대구산업정보대학 1997 논문집 Vol.11 No.2

The quality of an image is the clarity with which on important anatomical structure can be visualized. Image quality in CT depends on a number of factors that arises from measurement errors, representational errors, positioning errors and image discontinuity errors. Several approachs used to describe image quality were discussed briefly as a means of review, these approaches include the line spread function, the point spread function the contrast transfer function, and the modulation transfer function. Spatial resolution is used to describe the degree of unsharpness present in an image. It is often represented by the MTF. Contrast resolution is the ability of the scanner to detect small changes in tissue density. Several factors that affect contrast resolution in CT include slice thickness, pixel size, detector aperture, and radiation dose. Several phantoms have been designed to measure performance of the CT scanners. These include the contrast scale phantom, the edge phantom for spatial resolution. The effect of motion on CT images has been found to be degrading. Such effects can be minimized by the use of shorter scan times. Noise in CT can be described by the noise power spectrum. CT artifacts can be equipment related or patient related. Patient motion can produce streak artifacts, while the equipment can produce ring artifacts. Contrast enhancement in CT refers to the use of contrast media to improve visualization of structures within the patient.

자외선과 피부에 관한 고찰

장경자,임유성 경복대학 2000 京福論叢 Vol.4 No.-

태양은 우리의 삶에 필수적이다. 그러나 오늘날 CFC가 지구상의 생물체를 보호하는 오존층을 파괴하고 있다. 따라서 지상에 도달하는 태양광선의 양과 강도가 증가하고 있다. 몬트리올 의정서에 의해 CFC의 생산과 사용이 제한되고 있으나, 이미 사용되어 성층권에 존재하는 CFC가 사라지는데는 오랜 기간이 필요하다. 태양광선을 완전히 차단하기는 불가능하므로 피부에 대한 자외선의 효과와 자외선으로부터 피부를 보호할 수 있는 적절한 방법을 알아야 한다. 본 연구는 다음과 같은 내용을 포함한다. - 지구상의 태양광선의 양과 강도를 변화시키는 다양한 요소들 - 멜라노 타입에 따른 개인의 피부보호 능력과 광민감도 - 피부에 미치는 자외선의 즉각적, 지연된, 장기적인 효과 - 자외선에 대한 적절한 피부 보호 본 연구는 아래와 같이 결론지어 진다. 같은 환경아래서도 태양광선은 개인에 따라 다른 효과를 나타낸다. 이는 개개인의 멜라노 타입과 광민감도가 다르기 때문이다. 오존층파괴로 더 많은 자외선이 지상에 도달하고 현재로선 태양광선에 과도한 노출을 피하고 적절한 보호 방법을 취하는 것이 필요하다. 결국, 적절한 보호를 취하기 위해서는 개인의 멜라노 타입과 광민감도를 인지하는 것이 중요하다 하겠다. The sun is essential to our lives. But, at present the CFC's are depleting the ozone layer that protect the biological beings on the earth. In consequence the quality and the intensity of the solar radiation is increasing on the surface of the earth. In accordance with the Montreal Protocol the production and use of the CFC is limited 3ut it takes a long time for already used CFCs in the stratosphere to disappear. It is impossible to completely avoid solar radiation. Thus it is important to know the effects of solar ultraviolet radiation on human skin and appropriate actions people should take for protections against it. The contents of the study are as follows ; - the various factors modifying the quality and the intensity of solar radiation on the surface of the earth, - the protection capacity of skin and solar sensitivity of subjects according to the melanotype, - the immediate, delayed and long-term effects of solar UV radiation in human skin, - the appropriate protections for human ski1 against solar UV radiation. In conclusion this study disclosed followings ; At the same environmental conditions, the solar radiation effects are different for each individual, because of different melanotype and different solar sensitivity. Ozone depletion delivers more ultraviolet radiation to the surface of the earth and there is no safe way to tan at present. It is necessary to avoid overexposure or excess sunlight, and to take appropriate protections. Finally, it is important to recognize melanotype and solar sensitivity of subjects in order to get available protections.

鼻骨 側面像의 補助器具를 利用한 撮影法에 관한 硏究

金慶根,兪長壽 대구산업정보대학 1997 논문집 Vol.11 No.2

In the diagnostic radiology of the nasal bone disorder, there are various techniques for the general radiography of the nasal bone projection, but the lateral bone facets are not well demonstrated. So to solve these problems, we manufactured an aid device for the nasal bone lataral view. A nasal bone lateral aid device designed fabricated and applied to radiography has given : 1. The clean image of anatomical mechanism and facilitated in positioning. 2. Time saving in radiography. 3. We gained accurate image better than without aid device.

身體內 異物 位置 撮影에 관한 硏究

김경근,유장수 대구산업정보대학 2000 논문집 Vol.14 No.2

In the diagnostic radiology of the localization foreign body, conventional radiography are various technique. Radiographic foreign body localization is a procedure for determining the presence, and later the position, of any extraneous object or material within the body. For localization of foreign bodies, the radiographic method is the most satisfactory. It permits direct observation of the foreign body, as well as providing a permanent record. There are various methods of foreign body localization, each having its own particular merits. I discovered a new radiographic method. The method are as follows. 1. Arrange the tube and fluoroscopic screen as for ordinary horizontal fluoroscopy. Investigate for presence and position of the foreign body. Direct the path of the CR through the foreign body by narrowing or "closing down" the shutter opening, and mark the skin surface to identify the position of the foreign body. 2. Position the X-ray tube, aligning the CR to the spot marked on the skin surface. Select the most practical FFD. Which maybe 30, 36, or 40 inches, but the exact FFD must be known, at the time of exposure, the exact distance should be indicated on the film by suitable lead marks. (+ type) 3. Position the film beneath the part or area and make an exposure using about one-half to two-thirds of the mAs normally reguired for the part in question. 4. Shift the tube a known distance (about 25 percent of the FFD) cephalad, caudad, or transversely and make a second exposure using the same factors. 5. Process the film in the usual manner. 6. Carefully measure the distance between the two images of the foreign body as projected onto the film. 7. Apply the formula : Foreign body - Film distance =image shift × Focal - film distance/image shift - tube shift 8. Applied small focus and fixed FFD. I resulted used in this radiographic technique. 1. Time saving in radiography. 2. The clean image of foreign body on radiographic image. 3. I gained accurate image better than conventional radiography.

膵臟의 超音波 檢査에 관한 硏究

金慶根,兪長壽 대구산업정보대학 1997 논문집 Vol.11 No.2

The examination of abdominal organs such as stomach, pancreas, liver and kidney have been made by radiologic studies using contrast media and radio-isotope scan before, but today the utilization of computed tomography and ultrasound is increasing. The computed tomography is not available for the examination of infants in growing periods or pregnant women, for there is a large radiation hazard to the patient. Despite its merits of harmlessness, ultrasound has many limitations in observing the abdominal organs below the gas-filled stomach and intestine, because ultrasound cannot penetrate air and bone on account of its physical characteristics. Livers and gall bladders can be observed with ultrasound with relative success but highly sophisticated skills ara required to scan the pancreas which is located between the stomach and the duodenum. Authors scanned experimental ultrasonic examination. Sonic images obtained in each position after ingestion of water were compared with the general technique. The semi erect (20˚) ingestion water gastro window technique showed further improvement in 10 patients of pancreatic study examization. Using general technique, non visualization of the tail of pancreas occured. In contrast, with semi-erect(20˚) gastro window technique produced improved visualization.

다량의 균일한 액적 제조를 위한 분리막 기반 미세유체 소자 시스템

장문배, 유진오, 염경호 충북대학교 산업과학기술연구소 2013 산업과학기술연구 논문집 Vol.27 No.2

In this study, we designed the microfluidic device system based on the separation membrane for generating monodisperse emulsion droplets with diameters ranging from hundreds of nanometers to several micrometers. To generate fine droplets, T-junction and flow-focusing geometry are integrated into the microfluidic channel. Also put the membrane into the microfluidic device to make droplets effectively. PDMS devices can be easily, quickly, and inexpensively fabricated with superb resolution. However, PDMS devices are swelled other organic solvent. So we could produce droplets using fluorocarbon oil. The droplet size was controlled by adjusting the flow ratio between continuous phase flow and dispersed phase flow and also membrane pore size

Evolutionary Programming for Designing Independent Cells

문치웅,김장형,이유경 濟州大學校 産業技術硏究所 1997 산업기술연구소논문집 Vol.8 No.1

In this paper, an evolutionary programming approach is proposed for the designing independent cells in cellular manufacturing with alternative process plans and machine duplication consideration. Several manufacturing parameters such as production volume, machine capacity, processing time, number of cells and cell size are considered in the process. The model is formulated as a 0-1 integer programming and solved using genetic algorithm. It determines the machine cells, part families and process plan for each part simultaneously.

Sargassum horneri as a novel feedstock for lactic acid production

You-Kyung LEE,YeBin JU,JuEun JANG,YoungHyun KIM,Ga-Eun LEE,JungWon HEO,YeonHee SIN,Sangwon LEE,Sehwa JANG,Jeongman SEOL,Soo Rin KIM 한국생물공학회 2018 한국생물공학회 학술대회 Vol.2018 No.10

우울 증상이 호전된 비우울 집단과 우울집단 간의 인지요인의 비교

장유경(You-Kyung Jang),장세헌(Se-Heon Jang),제영묘(Young-Myo Jae),이대수(Dae-Su Lee),홍성욱(Sung-Wook Hong),윤창영(Chang-Young Yun) 대한생물치료정신의학회 2007 생물치료정신의학 Vol.13 No.2

본 연구는 우울증으로 진단받고 약물치료 후 우울증상이 잔존하는 우울군과 증상이 관해된 비우울군간의 인지요인의 특성을 비교분석하고자 하였다. 한국형우울척도(KDS)를 사용하여 우울군(n=18)과 비우울군(n=28)으로 나누었다. 자동적 사고 척도, 역기능적 태도척도, 귀인양식 척도를 시행하여 인지적 특성을 살펴보았다. 자동적 사고 척도에서는 두 군간의 유의미한 차이가 있었으며, 자동적 사고척도는 KDS와 강한 상관관계가 있었다. 역기능적 태도 척도와 귀인양식에서는 두 군간 의미있는 차이를 보이지 않았다. 이러한 연구 결과를 토대로 본 저자는 자동적 사고는 기분 상태 의존적인 인지요인이며 역기능적 태도와 귀인양식은 아마도 개인의 영속적인 특질을 반영하며 우울증과 관련하여서 자동적 사고에 비해 보다 지속적으로 영향력을 미치는 것으로 보았다. 따라서 우울 증상의 재발에 취약할 수 있는 기저의 우울 생성적 인지 요소를 제거하기 위해서는 약물치료에 의한 표면적인 우울증상의 감소 외에 보다 적극적인 치료적 개입이 요구됨을 제안하였다. Objectives:This study was performed to compare the cognitive factors between recently recovered non-depressed group and currently depressive group. Methods:To measure the degree of depressive mood, KDS(Korean Depression Scale) was used. We divided patients in two groups. One is recently recovered non-depressive group(n=28) and the other is currently depressive group(n=18) during antidepressant medication. To assess the cognitive state, we administered DAS(dysfunctional attitude scale), ASQ(attributional style questionnaire), and negative ATQ(automatic thought questionnaire). Results:In ATQ score, there was a significant difference between two groups(t=3.453, p=.002). ATQ score strongly correlated with KDS score(r=.786, p<0.01). But, there was no significant differences between two groups in mean scores of DAS and all positive and negative attributional style subscales, even though DAS score correlated with KDS score significantly(r=.383, p<0.01). This means that ATQ score decreased according to remission of depression. But DAS and especially negative attributional style score didn’t changed even though improvement of depression with antidepressant medication. Conclusions:We concluded that automatic thoughts were the mood state-dependent cognitive factor and dysfunctional attitude and attributional styles were cognitive factors that maybe reflect more permanent personal traits and underlying vulnerabilities of depression than automatic thoughts. We also concluded that the additive treatments more than antidepressant medication would be needed to change the dysfunctional attitudes and attribution styles, which could possibly act as the depressogenic factors in recently recovered non-depressive patients during maintenance antidepressant medication.

고관절 전치환술 환자의 임상관리도 수행 정도

임유진(Lim You Jin),정경인(Jeong Kyung In),정하윤(Jeong Ha Yun),선정주(Sun JeongJu),김윤경(Kim Yun Kyung),최지경(Choi Ji Kyung),이금례(Lee Kum Lae),김정숙(Kim Jeong Suk),양진주(Yang Jin Ju),김혜자(Kim Hye Ja),장금성(Jang Keum Seong) 한국성인간호학회 2006 성인간호학회지 Vol.18 No.5